Year % of GNI 2010 0.391439530182483 2011 0.355470508673977 2012 0.410806231885544 2013 0.409336100831485 2014 0.543993408414112 2015 0.45308321726233 2016 0.550282472921122 2017 0.405048578401979 2018 0.474435994555055 2019 0.483471178137977 2020 0.438718869937211 2021 0.486921122070309